检索结果-南通市图书馆

A Physical Simulation Test for the RockBurst in Tunnels

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2011年第2期8卷 278-285页

作者： LI Tianbin WANG Xiangfeng MENG Lubo state key {2. of Geohazard Prevention & Geoenvironment Protection Chengdu University of Technology Chengdu 610059 China Sichuan Communication surveying &Design Institute Chengdu 610017China

According to the test results of the physical and mechanical properties of similar materials in various quality mixture, a type of material with obvious tendency of rockburst was selected to produce a large-size model to simulate rockburst phenomena in tunnels. The prototype model comes from a typical section of diversion tunnels in Jinping Hydropower Station in china. The simulation of excavating tunnels is carried out by opening a hole in the model after loading. The modeling results indicated that under the condition of normal stresses in the model boundaries the arch top, spandrel and side walls of the tunnel produced an obvious jump reaction of stress and strain and the acoustic emission counts of the surrounding rock also increased rapidly in a different time period after the "tunnel" excavation, showing the clear features of rockburst. The spalling, buckling and breaking occurred in the surrounding rock of model in conditions of over loading. It is concluded that the modeling tunnel segment in Jinping Hydropower Station is expected to form the tensile rockburst with the pattern of spalling, buckling and breaking.

关键词： Rockburst Physical simulation Similar materials (Gypsum Cement Sand Water) Strain jump Spalling Buckling Breaking

Identification of Ice Elevation Change of the Shuiguan River No.4 Glacier in the Qilian Mountains,china

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2010年第4期7卷 375-379页

作者： LI Jing LIU Shiyin SHANGGUAN Donghui ZHANG Yinsong state key {2. of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China

GPS measurement,an effective method for surveying glacier surface topography,has been applied in some glaciers for many *** Shuiguan River No.4 glacier,a small glacier with its area of 1.84 km2.in 1972.located in the east of the Qilian Mountains,china,was selected to study its ice elevation change using GPS measurement in *** study was conducted on the ablation area with GPS-measured area 0.5 *** ice elevation change of the glacier was obtained by comparing the DEM obtained by a 1:50 000 topographic map made in 1972.with the DEM by GPS-measured data acquired in *** differences of the two DEMs showed the thinning condition of the glacier was *** mean thinning was 15±8 m with the mean thinning rate of 0.42.0.2. m a-1 for 1972.2.07 in the measurement area,which equaled 0.38±0.2. m yr-1 in water equivalent(w.e.).The prominent thinning occurred on the south part of the glacier,which was the area near the glacier terminus with the maximum thinning of 41±8 *** the thinning value of 15±8 m for the glacier area below 4640 m a.s.l.,the wasting ice mass was calculated to be 6.4±3.2.10-3 km3 for 1972.2.07,corresponding to 5.7±2.8×10-3 km3 w.e.,which meant that the montane runoff released by the glacier was at least 5.7±2.8×106 m3 between 1972.2.07.

关键词： GPS RTK DEM Glacier mass balance Mountane runoff

在线全文

学校读者我要写书评

暂无评论

煤系岩石产酸潜力的索氏淋滤实验评价

中国矿业大学学报 2013年第2期42卷 214-220页

作者：赵峰华孙红福刘乃利中国矿业大学(北京)地球科学与测绘工程学院北京100083 中国矿业大学(北京)煤炭资源与安全开采国家重点实验室北京100083

为了准确评价非均质性较强含煤岩系样品的产酸潜力,采用索氏淋滤实验方法对山西省西山煤田石炭二叠纪含煤岩系岩石样品的产酸潜力进行了评价,建立了煤系岩石产酸潜力的索氏淋滤实验评价方法.结果表明:1)淋出液pH值小于7、(Ca+Mg+Mn)/SO... 详细信息

为了准确评价非均质性较强含煤岩系样品的产酸潜力,采用索氏淋滤实验方法对山西省西山煤田石炭二叠纪含煤岩系岩石样品的产酸潜力进行了评价,建立了煤系岩石产酸潜力的索氏淋滤实验评价方法.结果表明:1)淋出液pH值小于7、(Ca+Mg+Mn)/SO2.-累积摩尔比小于1的样品被评价为产酸样品,反之被评价为不产酸样品.据此将西山煤田的泥岩、砂岩和菱铁矿等3个样品评价为不产酸样品(淋出液pH>8,(Ca+Mg+Mn)/SO2.-累积摩尔比1.99～2.91),2.非均质黄铁矿样品评价为强产酸样品(淋出液pH2.-累积摩尔比0.08～0.58);2.基于淋出液SO2.-浓度计算的2.非均质黄铁矿样品产酸速率分别为177.1mM[SO2.-]/(kg.d)和2.1.8mM[SO2.-]/(kg.d);基于淋出液(Ca+Mg+Mn)浓度计算的砂岩、泥岩和非均质菱铁矿样品酸中和速率为10.73～68.77mM[Ca+Mg+Mn]/(kg.d);3)产酸样品淋出液中SO2.-离子累积质量浓度为507～1 681mg/L,Fe离子累积质量浓度为135～753mg/L;不产酸样品淋出液中SO2.-离子累积质量浓度小于140mg/L,Fe离子累积质量浓度小于1.2.g/L;4)不产酸样品淋出液的S/Fe摩尔比大于66,2.产酸非均质黄铁矿样品淋出液的S/Fe摩尔比为0.95～3.2.5)样品淋滤过程中产生了赤铁矿、石膏和硬石膏等次生矿物相.

关键词：索氏淋滤实验产酸速率酸中和速率含煤岩系

Non-point source pollution of Wujiang River watershed in Guizhou Province, SW china

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 2006年第S1期 141-142页

作者： Congguo TANG1,2. Congqiang LIU1 1 state key {2. of Environmental Geochemistry, Institute of Geochemistry, chinese academy of Sciences, Guiyang 550002. china 2.Graduate School, chinese academy of Sciences, beijing 100049, china

Emergency assessment of seismic landslide susceptibility: a case study of the 2.08 Wenchuan earthquake affected area

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Earthquake engineering and engineering Vibration 2009年第2期8卷 207-217页

作者： Tang Chuan,Zhu Jing and Liang Jingtao state key {2. of Geo-Hazard Prevention,Chengdu University of Technology,Chengdu 610059,china Professor Associate Professor Graduate Student state key {2. of Geo-Hazard Prevention Chengdu University of Technology Chengdu 610059 China

The 8.0 Mw Wenchuan earthquake triggered widespread and large scale landslides in mountainous regions. An approach was used to map and assess landslide susceptibility in a given area. A numerical rating system was applied to five factors that contribute to slope instability. Factors such as lithology, topography, streams and faults have an important influence as event-controlling factors for landslide susceptibility assessment. A final map is provided to show areas of low, medium, and high landslide susceptibility. Areas identified as having high landslide susceptibility were located in the central, northeastern, and far south regions of the study area. The assessment results will help decision makers to select safe sites for emergency placement of refuges and plan for future reconstruction. The maps may also be used as a basis for landslide risk management in the study area.

关键词： landslide susceptibility gis Wenchuan earthquake Qingchuan area

Analysis of stability of coal pillars with multi-coal seam strip mining

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2011年第S3期21卷 549-555页

作者： ZHANG Li-ya, DENG Ka-zhong, ZHU Chuan-guang, XING Zheng-quan Jiangsu key laboratory of Resources and Environmental Information {2., china University of Mining and Technology, Xuzhou 2.1116, china Jiangsu key laboratory of Resources and Environmental Information {2. China University of Mining and Technology Xuzhou 221116 China

Strip mining is one of the efficient measures to control surface subsidence and mining damage. However, the researches on the laws of the geological mining factors to upper and lower pillar's stability are still deficient in multi-coal seam strip mining at present. Based on the three dimension fast Lagrangian analysis of continua (short for FLAC3D) numerical simulation software, the laws of the stress increasing coefficient on the coal pillar and its stability were systematically studied for different depths, different mining widths, different interlayer spacings, different mining thicknesses, different properties of interstratified rock and the spacial relations of the upper and lower pillars in vertical alignment in multi-coal seam strip mining. The function relation between the stress increasing coefficient of upper and lower pillars with the mining depth, mining widths, interlayer spacing, mining thickness, property of interstratified rock and the spatial relationship were obtained.

关键词： multi-coal seam strip mining FLAC3D numerical simulation stability of coal pillar

Simulation of Soil Organic Carbon Dynamics in chinese Rice Paddies from 1980 to 2.00

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2007年第1期17卷 1-10页

作者： ZHANG Wen YU Yong-Qiang SUN Wen-Juan HUANG Yao state key {2. of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100059 China

Changes in soil organic carbon （SOC） of rice paddies in china were simulated from 1980 to 2.00 by linking a coupled bio-physical model to gis database. The coupled model consists of two sub-models including Crop-C for simulating net primary productivity and hence residue retention and Soil-C for computing the turnover rates of SOC. The gis database included parameters of climate, soils and agricultural activities with the resolution of 10 km × 10 km. Model simulation indicated that chinese rice paddies covering 2..6 Mha sequestrated a considerable amount of C, about 0.15 ± 0.07 Pg C from 1980 to 2.00. Annual sequestration rate increased sharply from -180 ± 45 kg C ha^-1 year^-1 in 1980 to 440 ± 170 kg C ha^-1 year^-1 in 1989. Thereafter, a steaziy sequestration rate of 460 ± 170 kg C ha^-1 year^-1 occurred till 1994 and declined since then. Approximately 84% of the chinese rice paddies sequestrated carbon, while 15% lost carbon and 1% kept balance over the 2. years. Great SOC sequestration occurred in eastern, southern and central china, while a slight decline of SOC existed in some regions of northeastern and southwestern china.

关键词： chinese rice paddy gis model estimates SOC

青藏高原中部色林错湖近10年来湖面急剧上涨与冰川消融

在线全文

学校读者我要写书评

暂无评论

科学通报 2012年第5期57卷 571-579页

作者：孟恺石许华王二七刘锋中国科学院地质与地球物理研究所岩石圈演化国家重点实验室中国科学院研究生院 Department of Geosciences the Pennsylvania State UniversityUniversity ParkPA16802USA

量化了1976～2.10年间,特别是2.00～2.10年间西藏色林错、错鄂及班戈错的湖面面积及湖面海拔高度变化,分析了不同补给方式对湖面变化的影响,为最近10年青藏高原中东部气候变暖所致冰川加速消融提供了新证据.结合差分GPS实测湖面海拔、... 详细信息

量化了1976～2.10年间,特别是2.00～2.10年间西藏色林错、错鄂及班戈错的湖面面积及湖面海拔高度变化,分析了不同补给方式对湖面变化的影响,为最近10年青藏高原中东部气候变暖所致冰川加速消融提供了新证据.结合差分GPS实测湖面海拔、数字高程模型(DEM)及不同时相(1976～2.09年)湖面面积的遥感解译,研究提出:(1)近40年来色林错湖面海拔高度变化过程可分为两个阶段.1976～2.00年,色林错湖面海拔缓慢上升4.3m,平均0.18m/a;2.00～2.10年,湖面急剧上涨8.2.,平均0.82./a.与色林错近10年湖面海拔的快速增长对比,错鄂和班戈错的湖面上升趋势缓慢且平稳.(2.1976～2.09年间,色林错湖面面积变化过程经历了平稳增长→加速增长→平稳增长的变化过程.湖面总体扩大656.64km2.增长幅度为39.4%,特别是1999～2.09年间,湖面急剧扩大549.77km2.增长幅度为30.6%.根据气象数据相关性及湖水水位平衡分析,近期气温升高所致上游冰川的加速消融是色林错近10年湖面快速变化的主要因素--冰川融水直接导致色林错湖面上涨约8m,降水量的增加是影响湖面变化的次要因素;而主导班戈错湖面变化的因素是长期降水量的变化,气温的影响是次要因素.

关键词：色林错错鄂班戈错高海拔盐湖湖面上涨冰川消融气候变化相关分析

Evaluation of Fragility of the Economic System in Poyang Lake Ecological Economic Zone

在线全文

学校读者我要写书评

暂无评论

Asian Agricultural Research 2012年第8期4卷 72-76页

作者： CHENG Qiao-zhen 1 ,CHEN Xiao-ling 1. 2.,ZHU Feng-feng 1 ,ZHU Jing 1 1. School of Geography and Environment,Jiangxi Normal University,Nanchang 33002.,china 2. state {2. laboratory of Information engineering in surveying,mapping and Remote Sensing,Wuhan 43002.,china

From two aspects,namely the sensitivity of regional economic system to internal and external interference,and its resilience,we establish the evaluation indicator system of fragility of the economic system in Poyang Lake Ecological Economic Zone,and evaluate the internal differences in fragility of the regional economic system,using set pair analysis method. The results show that there is a great difference in fragility of the economic system between different administrative units; the difference in resilience is the major factor responsible for difference in fragility of the economic system in various cities and counties within the region; according to the difference in fragility characteristics,we conduct classification as follows: Nanchang City is a low-sensitivity and high-resilience type; Jiujiang City is a high-sensitivity and high-resilience type; Jiujiang County,Xingzi County,Yongxiu County,Hukou County,Duchang County,Ruichang County,De'an Xian,Wuning County,Pengze County,Leping City, Dongxiang County,Fengcheng City and Gao'an City are a high-sensitivity and low-resilience type; other cities and counties are a low-sensitivity and low-resilience type.

关键词： Fragility evaluation The economic system Poyang La